Vaporizer



- Dec. 6, 19 3 8. I P. o RITCHER ETAL 2,139,463

'VAPORIZER Filed June 26, 1937 Patented Dec. 6, 1938 UNITED STATES PATENT OFFICE VAPORIZER ington, Ky.

Application June 26,

1 Claim.

This invention relates to hand Vaporizers and is adapted particularly for insecticides having an oil base although it is useful in the application of paints and other disinfectants.

Hand Vaporizers may generally be placed in two groups, namely: the intermittent type and the continuous flow type. In the former the liquid is sprayed only when the pump plunger forces air across the atomizing nozzle and when the plunger is retracted some of the liquid is lost due to dripping which must take place since no air stream is present to atomize the liquid. In the continuous flow type, it is customary to compress the air above the liquid which is to be sprayed but with this type of vaporizer the liquid is sprayed with an uneven force because of pressure variations due to the change in the level of the liquid in the container. It is the aim of our invention to obviate these defects and provide a vaporizer which will break up the liquid into very fine droplets.

The main object of our invention is to construct a vaporizer which permits the liquid to be sprayed continuously in a misty condition.

A more specific object of our invention is to construct a vaporizer having an air chamber associated therewith in which compressed air may be stored to automatically spray the liquid.

A further object of our invention is to arrange the several parts of the vaporizer so that the flow of spraying liquid remains practically constant.

Referring to the accompanying drawing wherein similar numerals are used to indicate similar parts:

Figure 1 is a vertical sectional view of our device,

Figure 2 is a plan view of the same, and

Figure 3 is an end sectional view taken on the line 33 of Figure 1.

In the drawing we have shown an air pump of the ordinary type which comprises an air cylinder l having disposed therein a plunger ll consisting of, a rod l2 and a piston I3. An apertured head 14 is disposed at one end of the air cylinder and is adapted to receive the piston rod and permit reciprocation thereof. The opposite end of the air cylinder in front of the piston forms the air chamber 24 for the pump and it is provided with a small vent 30 through which air is forced. A valve is disposed between the piston l3 and the cylinder end and may take the form of a ball check valve generally shown at l9. This valve arrangement is customarily used on continuous hand sprayers and no detailed description is believed necessary.

In order that the liquid may be continuously 1937, Serial No. 150,588

sprayed and with very little variation in force, we have provided an air reservoir l5 which may be suitably attached to the pump adjacent its air chamber so as to receive air as it is forced by the piston. The air reservoir I5 may be formed integrally with the pump or as we have shown may be connected thereto by a web 16. Suitable openings I! and I8 may be formed in the air pump and reservoir respectively to provide for communication therebetween. A bafile 23 may be provided at the opening in the air reservoir to regulate or check the flow of air from the reservoir I5.

With an arrangement as above described there is no necessity for any direct communication between the liquid to be sprayed and the air in the reservoir 15. The container 20 for the liquid may, as shown in the drawing, be disposed within the air reservoir and sealed off therefrom. A small diameter fluid-tube 2! is disposed within the liquid and extends upwardly to a position adjacent the air vent 30 forming therewith an atomizing device. A small aperture may be provided in the filling cap of the container in order that the liquid may flow freely.

In use as the plunger is moved forward the ball valve !9 is unseated and air flows through the aperture 36 which reduces the atmospheric pressure in the tube 2! and causes the liquid to be forced out in the form of a spray. At the same time air is compressed in the chamber I5 so that when plunger is retracted the air which is compressed in the chamber l5 flows through the communicating openings l1 and I8 and through the aperture 3|] causing a continuous flow of the liquid.

What is claimed is:

A sprayer comprising a tubular casing, a pump chamber at one end of the casing,'an air chamber apertured at its forward end and disposed at the opposite end of the casing and a check valve between said chambers, an air reservoir in communication with said air chamber and having disposed therein a fluid container, a suction tube projecting from inside the fluid container to a position adjacent the aperture of said air chamber, said air reservoir being adapted to supply air to said air chamber during the suction stroke of the piston whereby toeffect a uniform and continuous spraying of liquid, and having a neck portion interconnecting it with the air chamber, and a baffle disposed in said neck portion to retard the flow of air between the air chamber and air reservoir.

PAUL O. RITCHER. ROBERT K. CALFEE. 

